地震作用下含软弱层锚固岩质边坡界面剪切作用

言志信; 李亚鹏; 龙哲; 翟聚云; 靳飞飞

doi:10.16511/j.cnki.qhdxxb.2019.26.011

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清华大学学报（自然科学版） ›› 2019, Vol. 59 ›› Issue (11) : 910-916. DOI: 10.16511/j.cnki.qhdxxb.2019.26.011

土木工程

地震作用下含软弱层锚固岩质边坡界面剪切作用

言志信¹, 李亚鹏^1,2, 龙哲¹, 翟聚云¹, 靳飞飞^1,2

作者信息 +

Interfacial shearing of anchored rock slopes with a weak layer under earthquake loading

YAN Zhixin¹, LI Yapeng^1,2, LONG Zhe¹, ZHAI Juyun¹, JIN Feifei^1,2

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文章历史 +

摘要

针对地震作用下全长黏结锚杆锚固岩质边坡锚杆-砂浆界面上和砂浆-岩体界面上，即两锚固界面上的剪切作用，利用FLAC^3D软件分别采用实体单元和接触面单元建立含软弱层锚固顺层岩质边坡数值模型，探究了水平向简谐波作用下两锚固界面上的剪切作用和锚杆轴力分布以及它们的演化规律。结果表明：采用实体单元和接触面单元相结合的建模方式可行，锚固界面剪切作用和脱黏破坏均可得到很好的体现和反映，两锚固界面上的剪应力和锚杆轴力的分布不均匀，软弱层处剪应力为零而轴力最大；随地震动持续输入，两锚固界面剪应力和锚杆轴力呈递增之势，锚固界面发生脱黏破坏并向锚杆两端发展，远离中性点的锚固界面得以调用，峰值剪应力向锚杆两端转移。揭示了地震作用下含软弱层锚固顺层岩质边坡破坏机理，对岩土锚固的研究和设计施工均具有重要意义。

Abstract

The bolt-grout and grout-rock interfaces of rock slopes anchored by full-length bonded bolts experience significant shear stresses during earthquakes which can lead to failures. This paper presents a numerical model of an anchored rock slope with a weak layer to predict these shear stresses using solid and interface elements in the FLAC^3D software. The model is used to predict the distributions of the anchorage interface shearing action and the anchor axial forces and how they evolve over time for a horizontal simple harmonic wave. The results show that solid elements can be combined with interface elements for modeling. The model can accurately predict the shear and debonding failure of the anchorage interface. The shear stresses at the two anchorage interfaces and the anchor axial force are not the same and the shear stress at the weak layer is zero while the axial force is the largest force. As the ground motion continues, the shear stresses at the two anchorage interfaces and the anchor axial force all increase. Debonding then occurs at the anchorage interface and develops toward both ends of the bolt and the anchorage interface far from the neutral point and the peak shear stress location moves to both ends of the bolt. The results show the failure mechanism of an anchored bedding rock slope with a weak layer during an earthquake, which is of great significance for designing geotechnical anchorage systems.

导出引用

言志信, 李亚鹏, 龙哲, 翟聚云, 靳飞飞. 地震作用下含软弱层锚固岩质边坡界面剪切作用[J]. 清华大学学报（自然科学版）. 2019, 59(11): 910-916 https://doi.org/10.16511/j.cnki.qhdxxb.2019.26.011

YAN Zhixin, LI Yapeng, LONG Zhe, ZHAI Juyun, JIN Feifei. Interfacial shearing of anchored rock slopes with a weak layer under earthquake loading[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(11): 910-916 https://doi.org/10.16511/j.cnki.qhdxxb.2019.26.011

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收稿日期	出版日期
2018-12-12	2019-11-15
发布日期
2019-11-19

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